FVC, peak expiratory flow (PEF), and FIF max can be read directly from a flow volume loop graph while the forced expiratory volume at one second (FEVI) and forced expiratory flow between 25 and 75% of vital capacity (FEF 25-75)), and FIF, all need to be calculated or read from a time volume curve.

For this study, multiple lung function tests were performed and significant changes were noted in four measurements: the FVC, or forced vital capacity, which reflects the volume of air that can be blown out after fully inhaling; the FEV1, or forced expiratory volume in 1 second, which is the volume of air that can forcibly be blown out in one second, after fully inhaling; the FEF, or forced expiratory flow, which reflects the flow of air coming out of the lungs during the middle portion of a forced exhalation; and the PEF, or peak expiratory flow, which is the maximal flow achieved when air is forcibly exhaled immediately after being inhaled.

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